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STMicroelectronics STM6720SFWB6F
- Part No.:
- STM6720SFWB6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
STM6720SFWB6F.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,705
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Product details
Overview
STM6720SFWB6F from STMicroelectronics is a dual ultra-low voltage supervisor IC with push-button reset, primary (VCC1) and secondary (VCC2) supply monitoring, adjustable RSTIN input (0.626 V reference), active-low push-pull RST output, and 900 ms typical power-up reset delay (trec). It operates from –40 °C to +85 °C and draws only 11 µA at 3.6 V, targeting battery-powered embedded systems requiring reliable multi-rail power sequencing and manual reset control.
For engineers reviewing the STM6720SFWB6F datasheet, STM6720SFWB6F pinout, STM6720SFWB6F application, or STM6720SFWB6F equivalent, key selection criteria include its SOT23-6 package, factory-trimmed VCC1 threshold (1.58 V–4.63 V), VCC2 threshold (0.79 V–3.08 V), guaranteed RST state down to VCC1/VCC2 ≥ 0.8 V, and compatibility with bi-directional processor reset interfaces via external series resistor.
Technical Context
This supervisor integrates three independent voltage comparators: one for VCC1 (factory-programmed threshold), one for VCC2 (also factory-programmed), and one for RSTIN referenced to a 0.626 V internal bandgap. All comparators feed into a logic-controlled reset generator that enforces a minimum 900 ms (typ) trec delay after all monitored supplies recover and MR returns high.
The RST output is push-pull active-low, referenced to VCC1, eliminating need for external pull-up; MR includes an internal 50 kΩ pull-up and supports direct switch-to-ground connection without debounce circuitry. The device guarantees valid reset assertion and release across its full industrial temperature range and supply voltage operating window (0.8 V to 5.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | Factory-programmed 1.58 V to 4.63 V; sets primary supply brown-out detection point with ±1.5% accuracy over temperature. |
| VCC2 Threshold | Factory-programmed 0.79 V to 3.08 V; enables independent monitoring of auxiliary rail (e.g., I/O or core voltage) without external components. |
| RSTIN Reference | 0.626 V internal bandgap; allows precise external resistor-divider configuration for custom reset thresholds on third rail. |
| trec Delay (Power-up) | 900 ms typical; ensures stable power sequencing before releasing processor reset, preventing premature boot under marginal supply conditions. |
| Supply Current | 11 µA typical at VCC1 = VCC2 = 3.6 V; minimizes quiescent load in always-on battery-backed subsystems. |
| Operating Temp | –40 °C to +85 °C; qualified for industrial environments including set-top boxes, portable instrumentation, and network edge devices. |
| VCC Validity Range | RST state guaranteed when VCC1 or VCC2 ≥ 0.8 V; ensures deterministic reset behavior during deep brown-out or partial power loss. |
Pinout & Package
SOT23-6 (WB) package: 6-pin surface-mount, 1.3 mm × 2.9 mm footprint, 1.45 mm height, lead pitch 0.95 mm, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RST | Active-low push-pull reset output | Drives low when any monitored supply fails or MR is asserted; remains low for trec after recovery; no external pull-up required. |
| 2: VCC1 | Primary supply voltage input | Power source and reference for RST output stage; also monitored for reset generation using factory-trimmed threshold. |
| 3: VCC2 | Secondary supply voltage input | Monitored independently with separate factory-trimmed threshold; supports dual-rail supervision without external comparators. |
| 4: MR | Push-button reset input | Active-low manual reset with internal 50 kΩ pull-up; compatible with momentary switch to ground; no external debounce needed. |
| 5: RSTIN | Adjustable reset comparator input | High-impedance input referenced to 0.626 V internal reference; enables third-rail monitoring via external resistor divider. |
| 6: VSS | Ground reference | Common return path for VCC1, VCC2, MR, RSTIN, and RST; must be low-impedance for accurate threshold tracking. |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-threshold supply monitoring | VCC1 and VCC2 thresholds factory-programmed and trimmed - eliminates external resistor networks and calibration effort. |
| Third-rail supervision via RSTIN | 0.626 V internal reference enables accurate, temperature-stable monitoring of arbitrary voltages (e.g., 1.2 V, 1.8 V, 2.5 V rails) using two external resistors. |
| Guaranteed RST validity down to 0.8 V | Ensures correct reset assertion even during deep brown-out, critical for fail-safe operation in battery-depleted or unregulated DC/DC scenarios. |
| 900 ms typ power-on reset delay | Provides sufficient time for power supplies, clocks, and PLLs to stabilize before CPU release - avoids boot failures in complex SoC systems. |
| Push-pull RST output | Eliminates need for external pull-up resistor and associated board space, leakage, and noise susceptibility - simplifies layout and improves reliability. |
Applications
| Set-Top Box Power Management | Portable Medical Monitor |
|---|---|
Use Scenario: Supervises 3.3 V main logic rail (VCC1), 1.8 V I/O rail (VCC2), and 1.2 V processor core rail (RSTIN) during cold start and brown-out events. IC Role / Device Role / Timing Role: Dual/third-rail supervisor enforcing synchronized reset release with 900 ms trec to ensure FPGA configuration and memory initialization complete before CPU boot. Use Value: Prevents corrupted firmware loads and bus contention by guaranteeing all rails are stable and within spec before releasing reset to the main SoC. |
Use Scenario: Monitors 3.0 V battery-backed real-time clock supply (VCC1), 2.5 V sensor interface rail (VCC2), and 1.5 V ADC reference (RSTIN) in handheld ECG unit. IC Role / Device Role / Timing Role: Ultra-low-current (11 µA) supervisor enabling >5-year shelf life on coin-cell backup; MR pin supports user-initiated self-test reset. Use Value: Extends battery life while ensuring deterministic reset behavior during low-battery shutdown and rapid re-power cycles. |
| Industrial Ethernet Gateway | Smart Home Hub Controller |
Use Scenario: Validates 5.0 V PoE-derived system rail (VCC1), 3.3 V PHY supply (VCC2), and 2.5 V switch fabric rail (RSTIN) after hot-plug insertion or transient overload. IC Role / Device Role / Timing Role: Industrial-grade (–40 °C to +85 °C) supervisor with guaranteed RST state at VCC ≥ 0.8 V - maintains reset integrity during PoE negotiation glitches. Use Value: Eliminates spurious reboots caused by brief PoE voltage dips, improving network uptime and reducing remote maintenance calls. |
Use Scenario: Supervises 3.3 V MCU supply (VCC1), 1.8 V Wi-Fi module rail (VCC2), and 0.9 V BLE radio supply (RSTIN) in battery-operated smart speaker hub. IC Role / Device Role / Timing Role: Push-pull RST output directly drives MCU reset pin without pull-up; MR supports hardware factory reset via hidden button. Use Value: Reduces BOM count and PCB area while enabling robust field recovery - critical for consumer devices with no service port access. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+ | Single-supply monitor (2.93 V threshold), SOT23-3, no VCC2 or RSTIN; 140 ms reset delay. | Lacks dual/third-rail capability and manual reset; suitable only for single-rail brown-out protection. | Select only if supervising one rail and board space is constrained to 3-pin footprint. |
| TPS3808G12DBVR | Single-supply (1.22 V threshold), SOT23-6, adjustable delay (0.5–10 s), but no secondary supply or RSTIN input. | Supports programmable delay but cannot monitor VCC2 or external rails - requires additional comparators for multi-rail systems. | Choose when precise delay tuning is critical and only one rail needs supervision; not a functional replacement for STM6720. |
Compared with MAX6326US29D3+ and TPS3808G12DBVR, the STM6720SFWB6F uniquely delivers integrated dual fixed-threshold monitoring plus RSTIN-based third-rail supervision in a single SOT23-6 package - reducing component count, layout complexity, and validation effort for multi-rail embedded systems.
Availability
STM6720SFWB6F is available at Aetrix Electronics and suitable for set-top box power management, portable medical monitors, industrial Ethernet gateways, and smart home hub controllers requiring stable component supply, long-term lifecycle support, and industrial-grade temperature performance.
Supply support for STM6720SFWB6F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power management devices, and sensors for automotive, industrial, and consumer markets.
The STM67xx family is engineered for ultra-low-power, multi-rail voltage supervision in space-constrained, battery-sensitive applications - emphasizing factory-trimmed accuracy, guaranteed reset behavior at low VCC, and minimal external component count.
FAQ
What is the function of the RSTIN pin on STM6720SFWB6F?
The RSTIN pin is a high-impedance input referenced to an internal 0.626 V bandgap voltage. When the voltage at RSTIN falls below this reference - set by an external resistor divider across the monitored rail - the RST output is driven low. This enables precise supervision of a third voltage rail (e.g., 1.2 V, 1.8 V) without adding discrete comparators or trimming resistors.
Can STM6720SFWB6F monitor both VCC1 and VCC2 simultaneously?
Yes. STM6720SFWB6F continuously monitors VCC1 and VCC2 using independent, factory-programmed comparators. If either supply drops below its respective threshold (e.g., 2.93 V on VCC1 and 1.68 V on VCC2), the RST output is immediately asserted low and held for the full trec delay after both supplies recover and MR returns high.
Is an external pull-up resistor required for the RST output?
No. STM6720SFWB6F features a push-pull RST output referenced to VCC1, meaning it actively drives both high and low states. Unlike open-drain variants (e.g., STM6719), it requires no external pull-up resistor - simplifying design, reducing BOM cost, and improving noise immunity on the reset line.
How does the manual reset (MR) pin behave during power-up?
The MR pin has an internal 50 kΩ pull-up to VCC1 and is active-low. During power-up, if MR is held low (e.g., by a pressed button), RST stays low. After MR is released, RST remains low for the full trec delay (900 ms typ) regardless of supply status - ensuring deliberate, debounced reset initiation without external timing components.
STM6720SFWB6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.05V, 2.925V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
STM6720SFWB6F FAQ
1.How can I place an order for STM6720SFWB6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM6720SFWB6F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM6720SFWB6F reliable?
The price and inventory of STM6720SFWB6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM6720SFWB6F is usually 5 days.
3.What payment methods are accepted for STM6720SFWB6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM6720SFWB6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM6720SFWB6F?
STM6720SFWB6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM6720SFWB6F order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM6720SFWB6F?
For technical support, including STM6720SFWB6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM6720SFWB6F requirements.
6.How does Aetrix verify that STM6720SFWB6F is sourced from the original manufacturer or authorized distributors?
All STM6720SFWB6F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM6720SFWB6F meets industry standards.
7.What is the process for return or replacement of STM6720SFWB6F?
All STM6720SFWB6F units undergo pre-shipment inspection (PSI). If there is an issue with STM6720SFWB6F, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM6720SFWB6F part is unused and in its original packaging.
Return procedure for STM6720SFWB6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM6720SFWB6F Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
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V6340RSP3B+
EM Microelectronic
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
Microchip Technology
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MCP111T-300E/TT
Microchip Technology
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MCP120T-315I/TT
Microchip Technology
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MCP809T-315I/TT
Microchip Technology
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